0
我有一个C头如下:混合使用C&C++中的码块链接错误
Utilities.h:
extern SHM shm; //a struct.
extern void GetDesktopResolution(int* width, int* height);
extern bool CreateSharedMemory(uintptr_t id);
extern bool OpenSharedMemory(uintptr_t id);
extern bool UnMapSharedMemory();
和实现是,仅仅实现上述功能的.c文件:
SHM shm = {0};
bool CreateSharedMemory(uintptr_t id)
{
//...
}
bool OpenSharedMemory(uintptr_t id)
{
//...
}
bool UnMapSharedMemory()
{
//...
}
这个编译非常好。
然后,我有一个main.cpp的文件,如下所示:
#include "Utilities.h"
void swapBuffers(void* dsp, unsigned long wnd)
{
if (!shm.mapped)
{
#if defined _WIN32 || defined _WIN64
OpenSharedMemory((uintptr_t)dsp) || CreateSharedMemory((uintptr_t)dsp);
#else
OpenSharedMemory((uintptr_t)wnd) || CreateSharedMemory((uintptr_t)wnd);
ftruncate(shm.hFile, shm.size);
#endif // defined
}
}
#endif // defined
当我编译它,我得到:
obj\Release\src\main.o:main.cpp:(.text+0x249): undefined reference to `OpenSharedMemory(unsigned int)'
obj\Release\src\main.o:main.cpp:(.text+0x26c): undefined reference to `CreateSharedMemory(unsigned int)'
c:/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/4.8.1/../../../../x86_64-w64-mingw32/bin/ld.exe: obj\Release\src\main.o: bad reloc address 0x1 in section `.text.startup'
collect2.exe: error: ld returned 1 exit status
但是,如果我变 “的main.cpp” 到“主.c“它编译得很好..我检查了.cpp文件是用g ++编译的,而.c文件是用gcc编译的,但由于某些奇怪的原因,这两个目标文件不能链接在一起。
任何想法我做错了什么?
你试过了:'extern“C”void GetDesktopResolution(int * width,int * height);'? – 2014-09-12 19:27:51
我做到了。当我这样做时,它会打印:'Utilities.h错误:期望的标识符或'('字符串常量之前的',因为它是一个'C'头文件 – Brandon 2014-09-12 19:29:42
so main.cpp try:'extern“C”{\ n#包括“Utilities.h”\ n}' – 2014-09-12 19:30:53